code: def test_no_init():
      with pytest.raises(wandb.errors.Error):
          WandbCallback()
  
file_path: wandb/tests/pytest_tests/unit_tests/test_keras.py
imports: import sys
  import pytest
  import wandb
  from keras import backend
  from keras.layers import LSTM, Concatenate, Dense, Embedding, Flatten, Input
  from keras.models import Model, Sequential
  from wandb.keras import WandbCallback
label_desc: Use image node_id 1 for calling a global function with example usage: test_no_init() without return types